This thermostat can save you money by programming up to four time/temperature set points. Enter one program for weekdays and separate programs for Saturday and Sunday. Program it to warm the home so it's comfortable when your family arises, set to reduce energy consumption during the day when no one is home, warm it up when people come home, and reduce again when everyone's sleeping. The LCD screen is a large 2 square inches, has large numerals for easy reading, and has a soothing blue backlight. The memory is non-volatile so will retain your programming during power failures, and there's a built-in provision for two AA batteries to maintain the clock settings and insure thermostat operation during power outages. There's an Energy Management Recovery feature that starts to heat or cool early so your home is at the proper temperature at the set times. Cool Savings will change cooling set point temperatures during high utility demand periods.